Possible routes include LAX-GRU, ICN-LAX, MUC/FRA-ICN in new KE F, and/or GRU/RIO-CDG and CDG-SIN/etc in AF F. So it's possible to fly a ST RTW without ever resorting to C. Additional legs could be booked in the old-style KE F (SIN-ICN, ICN-SYD/AKL), even though that's not as attractive. Africa may be the toughest, as AF doesn't have any flights with F to any of my destinations, and of course it's disappointing that there is no way to get to PPT in F anymore.